|Died||March 18, 1908 (aged 70–71)|
|Place of burial||Hampton National Cemetery, Hampton, Virginia|
|Service/branch||United States Navy|
|Unit||[[USS Lackawanna (1862)|USS LackawannaTemplate:Square bracket closeTemplate:Ship/maintenancecategory|
|Battles/wars||American Civil War|
• Battle of Mobile Bay
|Awards||Medal of Honor|
Michael Cassidy (1837 – March 18, 1908) was a Union Navy sailor in the American Civil War. He received the U.S. military's highest decoration called the Medal of Honor. He got the medal for his actions at the Battle of Mobile Bay.
Cassidy was born in 1837 in Ireland. He immigrated to the United States and was living in New York when he joined the Navy. He served during the Civil War as a landsman on the [[USS Lackawanna (1862)|USS LackawannaTemplate:Square bracket closeTemplate:Ship/maintenancecategory. At the Battle of Mobile Bay on August 5, 1864, Lackawanna engaged the [[CSS Tennessee (1863)|CSS TennesseeTemplate:Square bracket closeTemplate:Ship/maintenancecategory at close range. Cassidy distinguished himself as the sponger on a gun crew. For this action, he was presented the Medal of Honor four months later on December 31, 1864.
Cassidy's official Medal of Honor citation reads:
Served on board the U.S.S. Lackawanna during successful attacks against Fort Morgan, rebel gunboats and the ram Tennessee, in Mobile Bay, 5 August 1864. Displaying great coolness and exemplary behavior as first sponger of a gun, Cassidy, by his coolness under fire, received the applause of his officers and the guncrew throughout the action which resulted in the capture of the prize ram Tennessee and in the destruction of batteries at Fort Morgan.
- "Michael Cassidy". Hall of Valor. Military Times. Retrieved December 20, 2012.
- "Civil War Medal of Honor Recipients (A–L)". Medal of Honor Citations. United States Army Center of Military History. June 26, 2011. Retrieved December 20, 2012.
- "Hampton National Cemetery". United States Department of Veterans Affairs. August 13, 2012. Retrieved December 20, 2012.